{"id":71069,"date":"2020-02-23T22:07:58","date_gmt":"2020-02-23T19:07:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti"},"modified":"2020-03-03T16:14:34","modified_gmt":"2020-03-03T13:14:34","slug":"chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/chetvertushka-ethernet-a-staraya-skorost-novye-vozmozhnosti","title":{"rendered":"Etherneti neljane: vana kiirus, uued v\u00f5imalused","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/d10d96c9523f873599b9e858dfb50ce7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nSeltsiline, et 5. veebruaril k\u00e4esoleval aastal kinnitati uus standard 10-megabitisele Ethernetile. Jah, lugesite \u00f5igesti: k\u00fcmme megabitti sekundis.<\/p>\n<p>Kellele on 21. sajandil vajalik selline \"v\u00e4ike\" kiirus? Sellele, et asendada tohutut segadust, mida nimetatakse \"v\u00e4li bussiks\" \u2013 Profibus, Modbus, CC-Link, CAN, FlexRay, HART jne. Neid on liiga palju, nad ei ole omavahel \u00fchilduvad ja on suhteliselt keerulised seadistada. T\u00f5eliselt sooviks lihtsalt kaabli l\u00fclitisse \u00fchendada ja kogu lugu. Nagu tavalise Ethernetiga.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nJa peagi saab see v\u00f5imalikuks! Tere tulemast: \"802.3cg-2019 \u2013 IEEE standard Ethernetile \u2013 Lisand 5: F\u00fc\u00fcsikalise kihi spetsifikatsioonid ja haldusparameetrid 10 Mb\/s t\u00f6\u00f6ks ja sellega seotud voolutarnimiseks l\u00e4bi \u00fche tasakaalustatud paariga juhtmete.\" <\/p>\n<p>Miks on see uus Ethernet huvitav? Esiteks \u2013 see t\u00f6\u00f6tab \u00fche keermega paari peal, mitte nelja. Seega on tal v\u00e4iksemad pistikud ja \u00f5hemad kaablid. Ja saab kasutada juba paigaldatud keerme paari, mis viib anduriteni ja aktuaatoriteni.<\/p>\n<p>V\u00f5ite v\u00e4ita, et Ethernet t\u00f6\u00f6tab kuni 100 meetrit, kuid andurid asuvad palju kaugemal. T\u00f5epoolest, varem oli see probleem. Kuid 802.3cg t\u00f6\u00f6tab kuni 1 km! \u00dche paari peal! Mitte paha? <\/p>\n<p>Tegelikkuses on see veelgi parem: sama paari kaudu saab edastada ka voolu. Sellega me ka alustame.<\/p>\n<h3>IEEE 802.3bu Andmeside liinide kaudu toide (PoDL)<\/h3>\n<p>\nUsun, et paljud teist on kuulnud PoE-st (Power over Ethernet) ja teavad, et voolu edastamiseks on vaja 2 juhtme paari. Toite sisenemine\/v\u00e4ljund toimub iga paari trafo keskpuntides. \u00dche paari puhul on seda v\u00f5imatu teostada. Seet\u00f5ttu tuli leida teine lahendus. Kuidas t\u00e4pselt \u2013 on alloleval joonisel n\u00e4idatud. N\u00e4idisena on lisatud ka klassikaline PoE.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/bb89378da53efb0a9bbf0a9edf583155.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiin:<br \/>\nPSE \u2013 vooluallika seadmed (toiteallikas)<br \/>\nPD \u2013 toidetav seade (seade kaugemas otsas, mis vajab elektrit)<\/p>\n<p>Alguses oli 802.3bu-l 10 toiteklassid:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/5d089748498a37f5ae75cc0b8629dc42.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV\u00e4rvidega on eristatavad kolm tinglikku pingeklassi: 12, 24 ja 48V.<\/p>\n<p>M\u00e4rgistused:<br \/>\nVpse \u2013 toiteallika pinge, V<br \/>\nVpd min \u2013 minimaalne pinge PD-l, V<br \/>\nI max \u2013 maksimaalne vool joonel, A<br \/>\nPpd max \u2013 maksimaalne tarbitav v\u00f5imsus PD-l, W<\/p>\n<p>Protokolli 802.3cg lisandudes lisandus veel 6 klassi:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/cb2677254d132ad27c4daf06489795ea.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMuidugi, sellise mitmekesisuse korral peavad PSE ja PD koosk\u00f5lastama toiteklassid enne, kui peamist pinget antakse. Seda tehakse SCCP (Serial Communications Classification Protocol) abil. See on madala kiirususega protokoll (333 bit\/s), mis p\u00f5hineb 1-Wire'il. See t\u00f6\u00f6tab ainult siis, kui liinile ei ole antud peamist toidet (sealhulgas une re\u017eiimis).<\/p>\n<p>Blokeeringu diagrammil on kujutatud, kuidas toide antakse:<\/p>\n<ul>\n<li>antaakse 10 mA vool ja kontrollitakse, kas teisel pool on 4V stabilisaator<\/li>\n<li>teostatakse toiteklassi koosk\u00f5lastamine<\/li>\n<li>antaa peamine toide<\/li>\n<li>kui tarbimine langeb alla 10 mA \u2013 siseneb une re\u017eiimi (antakse ootev\u00f5imsus 3.3V)<\/li>\n<li>kui tarbimine \u00fcletab 1 mA \u2013 toimub v\u00e4ljund une re\u017eiimist<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/ac282970ea69804211da01c9c6a384b8.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nToiteklassi koosk\u00f5lastamine ei pruugi toimuda, kui see on eelnevalt teada. Sellist varianti nimetatakse Kiireks K\u00e4ivitamisre\u017eiimiks. Seda rakendatakse n\u00e4iteks autodest, kuna \u00fchendatud seadmete konfiguratsiooni muutmiseks ei ole vajadust.<\/p>\n<p>Une re\u017eiimi sisenemist v\u00f5ib algatada kas PSE v\u00f5i PD.<\/p>\n<p>N\u00fc\u00fcd liigume andmeedastuse kirjelduse juurde. Seal on samuti huvitav: standardses on m\u00e4\u00e4ratletud kaks t\u00f6\u00f6re\u017eiimi \u2013 pikk kaugus ja l\u00fchike kaugus. <\/p>\n<h3>10BASE-T1L<\/h3>\n<p>\nSee variant on m\u00f5eldud pika vahemaa jaoks (long reach). Peamised omadused on j\u00e4rgmised:<\/p>\n<ul>\n<li>toimeulatus \u2013 kuni 1 km<\/li>\n<li>juhtmed 18AWG (0.8 mm2)<\/li>\n<li>kuni 10 vahe\u00fchendust (ja kaks l\u00f5pp\u00fchendust)<\/li>\n<li>t\u00f6\u00f6re\u017eiim punkt-punkt<\/li>\n<li>t\u00e4isd\u00fcpleks<\/li>\n<li>s\u00fcmboolne kiirus 7.5 Mb\/s<\/li>\n<li>modulatsioon PAM-3, kodeerimine 4B3T<\/li>\n<li>signaaliga, mille amplituud on 1V (1Vpp) v\u00f5i 2.4V<\/li>\n<li>toetab Energy Efficient Ethernet (\"quiet\/refresh\" EEE)<\/li>\n<\/ul>\n<p>\nOn ilmne, et see variant on m\u00f5eldud t\u00f6\u00f6stuslikuks kasutamiseks, juurdep\u00e4\u00e4sukontrollis\u00fcsteemides, hoonete automatiseerimisel, liftides. Katusel asuvate chillereid, konditsioneere, ventilaatoreid juhtimiseks. V\u00f5i tehnilistes ruumides asuvate k\u00fcttekatelde ja pumpade juhtimiseks. Seega on palju v\u00f5imalusi peale t\u00f6\u00f6stuse. R\u00e4\u00e4kimata asjade internetist (IoT).<\/p>\n<p>Tuleb mainida, et 10BASE-T1 on vaid \u00fcks Standardse \u00dche Paari Etherneti (SPE) standarditest. On ka 100BASE-T1 (802.3bw) ja 1000BASE-T1 (802.3bp). T\u00f5si, neid arendati autot\u00f6\u00f6stuse rakenduste jaoks, seega on nende vahemaa vaid 15 (UTP) v\u00f5i 40 meetrit (STP). Kuid plaanides on juba ka kaugem 100BASE-T1L. Nii et tulevikus lisatakse automaatne kiirus\u00fchtlus. <\/p>\n<p>Praegu, kui koosk\u00f5lastamist ei kasutata, on v\u00e4lja kuulutatud liidese \u201ekiire k\u00e4ivitamine\u201c: v\u00e4hem kui 100 ms toite andmisest andmevahetuse alguseni.<\/p>\n<p>Veel \u00fcks valik (mittet\u00e4ielik) \u2013 edastusamplituudi suurendamine 1-lt 2.4 V-le, et parandada signaal\/\rum\u00fcra suhet, v\u00e4hendada vigade arvu ja kaitsta t\u00f6\u00f6stuslike h\u00e4irete vastu.<\/p>\n<p>Ja muidugi EEE. See on viis elektri s\u00e4\u00e4stmiseks, l\u00fclitades edastamise v\u00e4lja, kui andmeid ei edastata. Diagrammil on n\u00e4idatud, kuidas see v\u00e4lja n\u00e4eb:<br \/>\n<img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/888029d8582e22cb5c5bb39d5f485aa9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmeid pole \u2013 saadame s\u00f5numi \"ma l\u00e4ksin magama\" ja l\u00fclitame end v\u00e4lja. Aeg-ajalt \u00e4rkame ja saadame s\u00f5numi \"ma olen veel siin\". Kui andmed ilmuvad, saadetakse vastaspoolele hoiatusteade \"ma \u00e4rkan \u00fcles\" ja edastus algab. See t\u00e4hendab, et pidevalt t\u00f6\u00f6tavad ainult vastuv\u00f5tjad.<\/p>\n<p>N\u00fc\u00fcd vaatame, mida on v\u00e4lja m\u00f5eldud standardi teise variandi puhul.<\/p>\n<h3>10BASE-T1S<\/h3>\n<p>\nViimase t\u00e4he j\u00e4rgi on juba selge, et see on protokoll l\u00fchikeste vahede jaoks (short reach). Aga miks see vajalik on, kui l\u00fchikeste vahede puhul t\u00f6\u00f6tab ka T1L? Loe omadusi:<\/p>\n<ul>\n<li>ulatus kuni 15 m punkt-punkt re\u017eiimis<\/li>\n<li>t\u00e4isdupleks v\u00f5i pooldupleks<\/li>\n<li>juhtmed 24-26 AWG (0.2-0.13 mm\u00b2)<\/li>\n<li>s\u00fcmboolne kiirus 12.5 Mbaud<\/li>\n<li>DME, kodeerimine 4B5B<\/li>\n<li>signaal amplituudiga 1 V (1 Vpp)<\/li>\n<li>kuni 4 vahe\u00fchendust (ja kaks l\u00f5pp\u00fchendust)<\/li>\n<li>EEE tuge ei ole<\/li>\n<\/ul>\n<p>\nTundub, et pole midagi erilist. Miks see siis vajalik on? Seda on vaja:<\/p>\n<ul>\n<li>ulatus kuni 25 m multipunktre\u017eiimis (kuni 8 s\u00f5lme)<\/li>\n<\/ul>\n<p>\nJa seda:<\/p>\n<ul>\n<li>t\u00f6\u00f6re\u017eiim kollisioonide v\u00e4ltimisega PLCA RS (PHY-Level Collision Avoidance Reconciliation Sublayer)<\/li>\n<\/ul>\n<p>\nJa see on juba palju huvitavam, eks? Kuna see aitab oluliselt v\u00e4hendada kaableid juhtimiskappides, masinates, robotites ja autodest. Ja juba on ettepanekud kasutada seda I2C asendajana. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-gdansk\/\"   title=\"serverites\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4502\">serverites<\/a>, l\u00fclitites ja muudes elektroonikaseadmetes.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/98614d57cc671efc36bee4d3251f8e60.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKuid multipunktre\u017eiimil on ka puudused. Peamine neist on jagatav andmeedastuskeskkond. Loomulikult lahendatakse kollisioonid CSMA\/CD abil. Kuid ei ole teada, mis viivitus sellega kaasneb. Ja m\u00f5nede rakenduste jaoks on see kriitiline. Seet\u00f5ttu on uues standardis multipunkti t\u00e4iendatud spetsiaalse re\u017eiimiga PLCA RS (vaata j\u00e4rgmist jaotist).<\/p>\n<p>Teine puudus on see, et multipunktis ei t\u00f6\u00f6ta PoDL. See t\u00e4hendab, et toide tuleb edastada eraldiseisva kaabli kaudu v\u00f5i v\u00f5tta kusagilt kohapealt. <\/p>\n<p>Kuid PoDL t\u00f6\u00f6tab punkt-punkt re\u017eiimis ka T1S-l.<\/p>\n<h3>PLCA RS<\/h3>\n<p>\nSee re\u017eiim t\u00f6\u00f6tab j\u00e4rgmiselt:<\/p>\n<ul>\n<li>s\u00f5lmed jagavad omavahel identifikaatoreid, s\u00f5lm ID=0 muutub koordinaatoriks<\/li>\n<li>koordinaator edastab v\u00f5rgus BEACON signaali, mis t\u00e4hendab uue edastusts\u00fckli algust ja edastab oma andmepaketti<\/li>\n<li>andmepaketi edastamise j\u00e4rel liigub edastamise j\u00e4rjekord j\u00e4rgmisele s\u00f5lmele<\/li>\n<li>kui 20 bitti edastamiseks vajalikul ajal s\u00f5lm ei alusta edastamist, liigub j\u00e4rjekord j\u00e4rgmisele s\u00f5lmele<\/li>\n<li>kui k\u00f5ik s\u00f5lmed on andmed edastanud (v\u00f5i j\u00e4tnud oma j\u00e4rjekorra vahele), algab koordinaator uue ts\u00fckli<\/li>\n<\/ul>\n<p>\nKokkuv\u00f5ttes meenutab see TDMA-d. Kuid erip\u00e4ra on see, et s\u00f5lm ei kasuta oma ajaraami, kui tal pole midagi edastada. Ja raami suurus pole rangelt m\u00e4\u00e4ratletud, kuna see s\u00f5ltub s\u00f5lme edastatava andmepaketi suurusest. Ja k\u00f5ik see t\u00f6\u00f6tab standardsete Ethernet 802.3 raamide peal (PLCA RS ei ole kohustuslik, seega peab olema \u00fchilduvus).<\/p>\n<p>PLCA kasutamise tulemus on allpool joonistel. Esimene \u2013 latentsus s\u00f5ltuvalt koormusest, teine \u2013 l\u00e4bilaskev\u00f5ime s\u00f5ltuvalt edastavate s\u00f5lmede arvust. H\u00e4sti on n\u00e4ha, et latentsus on muutunud palju prognoositumaks. Ja halvemal juhul on see 2 j\u00e4rku madalam kui CSMA\/CD halvimatel juhtudel:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/62bd8e271e7d882095281b37f63d8426.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJa PLCA puhul on kanali l\u00e4bilaskev\u00f5ime k\u00f5rgem, kuna see ei kulu konfliktide lahendamiseks:<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/b66a9bb8836a6d8d9aa0b21d1136f186.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Pistikud<\/h3>\n<p>\nEsialgu valisime kuuest pistiku variandist, mille pakkusid erinevad firmad. Tulemuseks olid need kaks varianti: <\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/0edb52b01e5d082069a10d46a57cd540.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTavatingimustes valiti CommScope'i LC pistik IEC 63171-1. <\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/a4b8c60e1ffbb0008973a0c5fe1d8dca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRaskedest tingimustest valiti HARTING'i IEC 63171-6 (endine 61076-3-125) pistikute seeria. Need pistikud on kaitstud IP20 kuni IP67.<\/p>\n<p><img decoding=\"async\" alt=\"Etherneti neljane: vana kiirus, uued v\u00f5imalused\" src=\"\/wp-content\/uploads\/2020\/02\/88150dd0f844444ab76d6c3f394658f0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMuidugi v\u00f5ivad pistikud ja kaablid olla nii UTP kui ka STP. <\/p>\n<h3>Muud<\/h3>\n<p>\nTavaliselt v\u00f5ib kasutada tavalist nelja paari Etherneti kaablit, kasutades iga paari eraldi SPE kanali jaoks. Et mitte vedada nelja eraldi kaablit kuskile kaugele. V\u00f5i kasutada \u00fchte paari kaabli, mille l\u00f5pus on paigaldatud \u00fcheliiniline Etherneti l\u00fcliti. <\/p>\n<p>Kas see l\u00fcliti on v\u00f5imalik \u00fchendada otse ettev\u00f5tte kohaliku v\u00f5rku, kui kauguses on juba kiudoptiline v\u00f5rk. Saate sinna \u00fchendada andurid ja j\u00e4lgida nende n\u00e4itajaid siit. Otse v\u00f5rgu kaudu. Ilma liidese konverterite v\u00f5i v\u00e4ravate kasutamiseta. <\/p>\n<p>Ja need ei pea kindlasti olema andurid. Need v\u00f5ivad olla ka kaamerad, fonod v\u00f5i nutikad lambid. M\u00f5ne ventiili ajamid v\u00f5i turniketid sissep\u00e4\u00e4sudel.<\/p>\n<p>Seega avanevad huvitavad perspektiivid. T\u00f5en\u00e4oliselt ei asenda SPE k\u00f5ik v\u00e4ljaehitusbusid. Kuid ta v\u00f5tab neist \u00fcsna suure osa. Autos kindlasti.<\/p>\n<p><i>PS Ma ei leidnud standardi teksti vabatasustuses. \u00dclaltoodud teave on koostatud erinevatest esitlustest ja internetis kergesti k\u00e4ttesaadavatest materjalidest. Seega v\u00f5ib seal olla ebat\u00e4psusi.<\/i><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/489314\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>5 \u0444\u0435\u0432\u0440\u0430\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0433\u043e\u0434\u0430 \u0431\u044b\u043b \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0451\u043d \u043d\u043e\u0432\u044b\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u043d\u0430 10-\u043c\u0435\u0433\u0430\u0431\u0438\u0442\u043d\u044b\u0439 Ethernet. \u0414\u0430, \u0432\u044b \u0432\u0435\u0440\u043d\u043e \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u043b\u0438: \u0434\u0435\u0441\u044f\u0442\u044c \u043c\u0435\u0433\u0430\u0431\u0438\u0442 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443. \u0414\u043b\u044f \u0447\u0435\u0433\u043e \u0432 21-\u043c \u0432\u0435\u043a\u0435 \u043d\u0443\u0436\u043d\u0430 \u0442\u0430\u043a\u0430\u044f \u00ab\u043c\u0430\u043b\u0435\u043d\u044c\u043a\u0430\u044f\u00bb \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c? \u0414\u043b\u044f \u0437\u0430\u043c\u0435\u043d\u044b \u0442\u043e\u0433\u043e \u0437\u043e\u043e\u043f\u0430\u0440\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043a\u0440\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u0451\u043c\u043a\u0438\u043c \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c \u00ab\u043f\u043e\u043b\u0435\u0432\u0430\u044f \u0448\u0438\u043d\u0430\u00bb \u2014 Profibus, Modbus, CC-Link, CAN, FlexRay, HART \u0438 \u0442.\u0434. \u0418\u0445 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u043c\u043d\u043e\u0433\u043e, \u043e\u043d\u0438 \u043d\u0435\u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u044b \u043c\u0435\u0436\u0434\u0443 \u0441\u043e\u0431\u043e\u0439 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